Boiler



April 11, 1933. w, s, ONROE BOILER Original Filed Jan. 19, 1928 2 Sheets-Sheet 1 ,w/w/ ATTORNEYS Ap 1933. w. s. MONROE. 1,903,515

BOILER qii ingl Filed Jan. 19, 1928 2 Sheets-Sheet 2 71/ INVENTOR BY r J ATTORNEY v lower tubes, and may rest upon shoulders 11 Patented Apr. 11, 1933 PATENT" OFFICE WILLIAM S. MONROE, OF CHICAGO, ILLINOIS BOILER Application filed January 19, 1928, Serial No. 247,762. Renewed June 23, 1932.

tubes in series through which feed water passes before it reaches the wall tubes. The invention will be understood from the description in connection with the accompanying drawings, in which Fig. 1 is a vertlcal 19 section through an illustrative embodiment of the invention taken along the line 11 of Fig. 2 or 3; Fig. 2 is a section along the line 22 of Fig. 1, and Fig. 3 is a section.

along the line 33 of Fig. 1.

In the drawings, reference character 8 1ndicates a furnace that may be provided with a fuel burner 9. A passage 10 for hot products of combustion is provided above the rear wall of the furnace, and a fine 12 leads downwardly from this passage to an outlet or stack. Transverse U-tubes 13 extend horizontally across the flue 12 and are connected to headers 14 so that water can be forced through the tubes in series. The upper tubes of the series are preferably longer than the formed along the rear wall of the furnace. The headers 14 constitute one side of the flue 12. A feed water inlet is connected to the lowest header 15 and leads from the feed pump 16 to which feed water may be supplied from any convenient source.

A tube 17 connectsthe upper header 14 of the series of headers 14 to a vertical drum or separator 18, this tube 17 being outside of the furnace walls. The tube 19 leads from the steam space of the separator 18 to the superheater 20 in the flue 12 and a tube 21 leads from the superheater to the steam main.

A tube 22 leads from the lower end of the separator 18 to a pump, 23 from which the discharge pipe 24 provided with branches 25 leads to the distributing header 26 surrounding the lower end of the furnace 8. A

valve 27 is provided in the tube 22 and a valved blow-off pipe 28 is provided above the valve 27 for blowing off water to prevent over concentration in the water which is circulated around and around through the furnacewall cooling tubes. The water can be blown off intermittently or continuously.

Vertically disposed furnace, wall tubes 30 are installed along'the inside walls of the furnace. V The ends of the tubes 30 extend outwardly through the furnace walls and are connected to vertically disposed containers or cylinders 31. A'row of U-tubes 32 of dif ferent lengths'extend along the inside of the bridge wall 33 with their ends extending through the side walls of the furnace and connected to the last ones of the cylinders 31 nearest the flue 12. The lower ends ofthe cylinders 31 are connected by nipples 35 to theheader 26. The upper ends of the cylinders 31 are connected by nipples 36 to a U- shaped upper header 37 from which tubes 38 lead to the separator 18. In operating the boiler, the water level is maintained at the desiredheight in the separator 18 by-maintaining the rate of feed sufficient to compensate for the water that is evaporated, thus keeping the water at the proper level.

The operation is as follows: Water is fed by the pump 16 into the lowermost header 15, and passes upwardly in succession through the U-tubes 13 to the upper header 14, from the ends of which thewater or mixture of steam and water passes through the tube 17 to the separator 18. The water passes downwardly through the tube 22, pump 23, tubes 24 and 25 into the header 26, through nipples 35to cylinders 31, thence upwardly through the tubes 30 and 32, where steam'is generated. The steam and water pass fromthe upper ends of tubes 30 and 32 into the upper portions of cylinders 31 where separation takes place, the water flowing downwardly in the cylinders 31 into the lower ends of the tubes 30 and 32, and the steam and some entrained water flowing through the nipples 36 into the header 37 from which the mixture passes through tubes 38 to the separator 18. The

hot products of combustion in the furnace 8 heat the tubes 30 and 32 for steam generation purposes and cause natural or ravity circulation of the steam and water through these tubes and the cylinders 31,'and then passdownwardly through the flue 12 to heat the incoming feed water from which some steam may be generated before it is fed into the'seperator 18. The hot products of 00111- bustion in the flue 12 and the water through the tubes 13 flow in countercurrent directions. I claim: 7

1. In a boiler, a furnace, upright furnace wall tubes, upright containers located outside ofsaid furnace with the endsof said tubes connected thereto, connections from the 10 upper ends of said containers to a steam and water separator, and connections from said separator to the lower ends of said containers. 2. In a boiler, a furnace, upright furnace wall tubes, upright containers each larger than one of said tubes located outside of said furnace with each having the ends of several of said tubes connected thereto, a horizontally disposed header near the lower end of said furnace, and connections from said containers to said header. 1 i

3. In a boiler, a furnace, upright furnace wall tubes, upright containers located outside vof said furnace with eachshaving the ends of several of said tubes connected thereto, a horizontally disposed. header near the lower end of said furnace, connections from said containers to said header, and a connection from said header to a pump.

4. In a boiler, a furnace, upright furnace I wall tubes, upright containers each larger than one of said tubes located outside of said furnace with the ends of said tubes connected thereto, a header, connections from the lower ends of said containers to said header, and means for conducting water into said header.

5. A steam boiler comprising upright furnace wall cooling tubes connected at their ends, to upright containers each larger than one of said tubesplaced outside of the furnace, each of said containers having the ends of-several of said tubes connected thereto, a drum extending horizontally around the furnace, the lower ends of said containers being connected to said drum, and connections leading from the top of said vertically extending containersfor discharging the steam generated.

6. A steam boiler comprising upright fur- 56' nace wall cooling tubes connected at their the furnace, a separator at a higher level than said tub-es, and connections from said containers to said separator. 1

7 In a steam boiler, upright furnace wall tubes, upright containers outside of the furnace to which the ends of said tubes are connected, a steam and water separator, and connections from said containers to said separator to provide circulation between them.

8. In a boiler, a furnace, upright wall tubes arranged in groups, and upright containers located outside of said furnace and each having a group of said tubes directly connected thereto.

9. In a boiler, a furnace, upright wall ends to upright containers placed. outside of tubes arranged in groups, and upright containers located outside of said furnace, said containers extending substantially the length of said furnace and each having a group of said tubes directly connected thereto.

11. In a boiler, a furnace, upright furnace wall tubes, upright containers located outside of said furnace with the ends of said tubes directly connected thereto, a horizontally disposed header near the lower end of said furnace, and connections from said containers to said headers.

WILLIAM s. MONROE. f 

